After gameplay I retimed this run using https://somewes.com/frame-count/ with a console FPS of 60.098813897441 which is the SNES native framerate according to http://tasvideos.org/PlatformFramerates.html and raw video framerate of 30 FPS for a total of 24612 frames or a Console Time of 13:40.399. First Frame set the frame before the Koopa disappears and End Frame set on the frame Bowser's hammers are invisible after touching the axe on 8-4.

I use Super NES Control Deck Model No. SNS-101 with "Super Mario Collection" cartridge model SHVC-4M and GV-USB2 Capture Card. PB achieved during "J Timing" attempt, console check at the end of that run.